Phosphonite or phosphonate compounds and use thereof

Phosphonite and phosphonate compounds ##STR1## wherein X.sup.1, X.sup.2, X.sup.3 and X.sup.4 are each independently a group of the formula ##STR2## wherein R is a hydrogen atom or a methyl group, p is 0 or 1, q is independently 0 or 1 with regard to each repeat unit, and m is an integer of 2 to 10, a stabilizer for organic materials comprising said compound and a stabilized organic material comprising said compound. The compound of the present invention is less volatile at high temperatures. The use of the compound of the present invention as a stabilizer for organic materials affords an extremely useful organic material which is superior in heat stability and free of degradation caused by oxidation. The compound of the present invention has excellent compatibility with the above-mentioned organic materials and hardly migrate from the organic materials. Thus, the compound of the present invention can reside in the organic material for a prolonged period of time, which in turn stabilizes the organic materials in a sustained manner.

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Claims

1. A compound of the formula ##STR19## wherein X.sup.1, X.sup.2 and X.sup.4 are each independently a group of the formula ##STR20## wherein R is a hydrogen atom or a methyl group, X.sup.3 is independently, with regard to each repeat unit, a group of the formula ##STR21## wherein R is a hydrogen atom or a methyl group, p is 0 or 1, q is independently 0 or 1 with regard to each repeat unit, and m is an integer of 2-10.

2. A compound of the formula (II) ##STR22## wherein X.sup.1, X.sup.2, X.sup.3, X.sup.4 and X.sup.5 are each independently a group of the formula ##STR23## wherein R is a hydrogen atom or a methyl group, and p, q and r are each independently 0 or 1.

3. A compound of the formula (III) ##STR24## wherein X.sup.1, X.sup.2, X.sup.3, X.sup.4 and X.sup.5 are each independently a group of the formula ##STR25## wherein R is a hydrogen atom or a methyl group, and p, q and r are each independently 0 or 1.

Referenced Cited
U.S. Patent Documents
3825629 July 1974 Hofer et al.
3928510 December 1975 Hofer et al.
3954847 May 4, 1976 Hofer et al.
3962175 June 8, 1976 Hofer et al.
4075163 February 21, 1978 Hofer et al.
4115639 September 19, 1978 Brown et al.
4261880 April 14, 1981 Fujii et al.
4952649 August 28, 1990 Kioka et al.
5109043 April 28, 1992 Bohshar et al.
5300257 April 5, 1994 Akashi et al.
5342869 August 30, 1994 Stoll et al.
Foreign Patent Documents
1 372 528 October 1974 GBX
2 215 727 September 1989 GBX
2 227 490 August 1990 GBX
2 276 387 September 1994 GBX
Other references
  • Kaminsky et al., Journal of Polymer Science: Polymer Chemistry Edition, vol. 23, pp. 2151-2164 (1985).
Patent History
Patent number: 5703150
Type: Grant
Filed: Dec 27, 1995
Date of Patent: Dec 30, 1997
Assignee: Yoshitomi Pharmaceutical Industries, Ltd. (Osaka)
Inventors: Tetsuji Ike (Fukuoka), Takeshi Inoue (Fukuoka), Yoshihiro Ozaki (Osaka)
Primary Examiner: Sharon Gibson
Assistant Examiner: Deanna Baxam
Law Firm: Wenderoth, Lind & Ponack
Application Number: 8/579,256